Filler Replacement in Flexible Pavement

For pavements to serve satisfactorily under the adverse conditions of increasing traffic, the paving engineers are required to design and construct the pavements with better strength and durability. The pavement contains different layers, each with their respective engineering properties. One of the important component is the filler, which are fine materials which fill up the pores of the pavement making it impervious and hence giving better strength. The filler and asphalt combine to form a mastic which acts to fill voids and also bind aggregates together to a dense mass. In this experiment five types of filler are used to check their effect on the pavement strength. It was found that rice husk ash and GGBS cannot be used as fillers for their properties do not bind with the other components. On the other hand, marble powder, micro silica and pond ash have shown considerable results. The pond ash has not only shown better strength than fly ash but is also more economical than flyash.